Update lachlanevenson/k8s-kubectl Docker tag to v1.16.3

This MR contains the following updates:

Package	Type	Update	Change
lachlanevenson/k8s-kubectl	image	patch	v1.16.2 -> v1.16.3

---

Renovate configuration

📅 Schedule: At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever MR becomes conflicted.

🔕 Ignore: Close this MR and you won't be reminded about this update again.

---

• If you want to rebase/retry this MR, check this box

---

Available now for GitLab: Renovate Pro with real-time webhook handling and priority job queue.